Some banks provide just Maestro cards without a cvv. Here ability to add to add bank accounts directly like PayPal seems helpful.
Not just maestro, also Visa or MasterCard, tough I don’t see a direct debit based system like PayPal has happening anytime soon. More easily could Curve just accept no CVV, like Amazon does
I was not aware that Amazon does it without a cvv. I don’t know if it’s something Curve can do.